[Structure peculiarities, conditions and factors preceding the development of heart rhythm disorder in Chernobyl cleanup workers].

3595 participants of liquidation of consequences of Chernobyl accident (LCA) have been follow-upped since 1986. Structure and factors prior the development of heart rhythm derangements, results of physical examination, tonometry, ECG daily monitoring with taking into account the variability of heart rhythm, data of echocardiography with Doppler analysis have been established in 742 patients. Extrasystolic arrhythmia (50.8%) and atrium fibrillation prevailed in clinical structure of clinical structure of heart rhythm disorders (HRD). Etiological factors of HRD in 91.1% of cases were ischemic heart disease (IHD), hypertension and especially their combination, in 4.6%--other disorders, 4.6%--idiopathic HRD. It is possible to address special significance among factors before the development of HRD the following ones: participation in LCA since 1986, shift team work, ionizing radiation > or = 25 c3B, negative thoughts and memory about these events, from style of living--smoking habit, professional contact with xenobiotics, increased levels of arterial pressure, cholesterin, body weight index. Especial attention should be given to as predictors of the development of HRD -increased myocardium weight index > or = 170 gr/M2, duration of common and painless myocardial ischemia, basal frequency of heart rhythm > or = 75 b./m. It was established reliable relation between ventricular extrasystole and decreased of common BCP (r = -0.57; P < 0.05), spectrum power, (r = -0.52; P < 0.05), correlation disorder between its components. It is logical there was influence caused by combination of factors arised in connection with Chernobyl accident, life style and structural and functional changes of myocardium, hypertension and ischemic heart disease which are often found in Chernobyl disaster fighters.